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851.
Xiaoyong Liu Xiaole Pan Jie Li Xi Chen Hang Liu Yu Tian Yuting Zhang Shandong Lei Weijie Yao Qi Liao Yele Sun Zifa Wang Hong He 《环境科学学报(英文版)》2022,34(5):465-473
Cross-boundary transport of air pollution is a difficult issue in pollution control for the North China Plain. In this study, an industrial district (Shahe City) with a large glass manufacturing sector was investigated to clarify the relative contribution of fine particulate matter (PM2.5) to the city's high levels of pollution. The Nest Air Quality Prediction Model System (NAQPMS), paired with Weather Research and Forecasting (WRF), was adopted and applied with a spatial resolution of 5 km. During the study period, the mean mass concentrations of PM2.5, SO2, and NO2 were observed to be 132.0, 76.1, and 55.5 μg/m3, respectively. The model reproduced the variations in pollutant concentrations in Shahe at an acceptable level. The simulation of online source-tagging revealed that pollutants emitted within a 50-km radius of downtown Shahe contributed 63.4% of the city's total PM2.5 concentration. This contribution increased to 73.9±21.2% when unfavorable meteorological conditions (high relative humidity, weak wind, and low planetary boundary layer height) were present; such conditions are more frequently associated with severe pollution (PM2.5 ≥ 250 μg/m3). The contribution from Shahe was 52.3±21.6%. The source apportionment results showed that industry (47%), transportation (10%), power (17%), and residential (26%) sectors were the most important sources of PM2.5 in Shahe. The glass factories (where chimney stack heights were normally < 70 m) in Shahe contributed 32.1% of the total PM2.5 concentration in Shahe. With an increase in PM2.5 concentration, the emissions from glass factories accumulated vertically and narrowed horizontally. At times when pollution levels were severe, the horizontally influenced area mainly covered Shahe. Furthermore, sensitivity tests indicated that reducing emissions by 20%, 40%, and 60% could lead to a decrease in the mass concentration of PM2.5 of of 12.0%, 23.8%, and 35.5%, respectively. 相似文献
852.
Qiang Zeng Pan-Pan Chen Pan Yang Chong Liu Yan-Ling Deng Qiong Luo Yu Miao Min Zhang Fei-Peng Cui Jia-Yue Zeng Tian Shi Ting-Ting Lu Da Chen Long-Qiang Wang Chun-Ping Liu Ming Jiang 《环境科学学报(英文版)》2022,120(10):30-40
Phenols have been shown to influence the cellular proliferation and function of thyroid in experimental models. However, few human studies have investigated the association between phenol exposure and thyroid cancer, and the underlying mechanisms are also poorly understood. We conducted a case-control study by age- and sex-matching 143 thyroid cancer and 224 controls to investigate the associations between phenol exposures and the risk of thyroid cancer, and further to explore the mediating role of oxidative stress. We found that elevated urinary triclosan (TCS), bisphenol A (BPA) and bisphenol S (BPS) levels were associated with increased risk of thyroid cancer (all P for trends < 0.05), and the adjusted odds ratios (ORs) comparing the extreme exposure groups were 3.52 (95% confidence interval (CI): 2.08, 5.95), 2.06 (95% CI: 1.06, 3.97) and 7.15 (95% CI: 3.12, 16.40), respectively. Positive associations were also observed between urinary TCS, BPA and BPS and three oxidative stress biomarkers measured by 8-hydroxy-2′-deoxyguanosine (8-OHdG), 8-iso-prostaglandin F2α (8-isoPGF2α) and 4-hydroxy-2-nonenal-mercapturic acid (HNE-MA), as well as between urinary 8-isoPGF2α and HNE-MA and the risk of thyroid cancer. Mediation analysis showed that urinary 8-isoPGF2α mediated 28.95%, 47.06% and 31.08% of the associations between TCS, BPA and BPS exposures and the risk of thyroid cancer, respectively (all P < 0.05). Our results suggest that exposure to TCS, BPA and BPS may be associated with increased risk of thyroid cancer and lipid peroxidation may be an intermediate mechanism. Further studies are warranted to confirm the findings. 相似文献
853.
Hezhong Tian Lining Luo Xiaoxuan Bai Shuhan Liu Bobo Wu Wei Liu Yunqian Lv Zhihui Guo Shumin Lin Shuang Zhao Yan Hao Jiming Hao Kai Zhang Aihua Zheng 《环境科学学报(英文版)》2022,34(11):187-198
Particulate matter (i.e., PM1.0 and PM2.5), considered as the key atmospheric pollutants, exerts negative effects on visibility, global climate, and human health by associated chemical compositions. However, our understanding of PM and its chemical compositions in Beijing under the current atmospheric environment is still not complete after witnessing marked alleviation during 2013–2017. Continuous measurements can be crucial for further air quality improvement by better characterizing PM pollution and chemical compositions in Beijing. Here, we conducted simultaneous measurements on PM in Beijing during 2018–2019. Results indicate that annual mean PM1.0 and PM2.5 concentrations were 35.49 ± 18.61 µg/m3 and 66.58 ± 60.17 µg/m3, showing a positive response to emission controls. The contribution of sulfate, nitrate, and ammonium (SNA) played an enhanced role with elevated PM loading and acted as the main contributors to pollution episodes. Discrepancies observed among chemical species between PM1.0 and PM2.5 in spring suggest that sand particles trend to accumulate in the range of 1–2.5 µm. Pollution episodes occurred accompanied with southerly clusters and high formation of SNA by heterogeneous reactions in summer and winter, respectively. Results from positive matrix factorization (PMF) combined with potential source contribution function (PSCF) models showed that potential areas were seasonal dependent, secondary and vehicular sources became much more important compared with previous studies in Beijing. Our study presented a continuous investigation on PM and sources origins in Beijing, which provides a better understanding for further emission control as well as a reference for other cities in developing countries. 相似文献
854.
对辐射环境模型AP9/AE9/SPM进行了系统研究,重点分析了AP9/AE9/SPM辐射环境模型的发展历程、建模数据、模型能力、模型使用方法、模型特点和局限性以及发展趋势。总结了AP9/AE9/SPM辐射环境模型“螺旋式上升”研发途径中所发布的11个版本的特点、数据覆盖时间范围和能量范围。指出AP9/AE9/SPM辐射环境模型在研发过程中是通过不断地将最新的观测数据和理论知识进行整合,达到扩展模型能量覆盖范围、增加空间粒子分布的目的。最新的AP9/AE9/SPM辐射环境模型具备了命令行和图形用户接口应用程序2种灵活便捷的使用方式,能覆盖完整的辐射带空间,基本实现了电子和质子能量范围的全覆盖。但目前最新版本的AP9/AE9/SPM仍然存在一些局限,这些局限会随着辐射带探测数据的积累和人类对辐射带机理的进一步认知而逐渐得到改善。该研究可帮助用户快速了解并正确使用AP9/AE9/SPM辐射环境模型,为我国自主辐射环境模型研发提供重要参考。 相似文献
855.
Li Ke Fan Guangsen Tian Huafeng Yuan Li Yao Yuanyuan Xiang Aimin Luo Xiaogang 《Journal of Polymers and the Environment》2021,29(10):3263-3270
Journal of Polymers and the Environment - With the advantages of excellent processability and biodegradability, polyvinyl alcohol (PVA) becomes an environmentally friendly and biocompatible... 相似文献
856.
Shanshan Zhao Zhu Tao Liwei Chen Muqiao Han Bin Zhao Xuelin Tian Liang Wang Fangang Meng 《Frontiers of Environmental Science & Engineering》2021,15(4):63
857.
Li Xiaoguang Li Zhonghong Du Caili Tian Zhenjun Zhu Qiuheng Li Guowen Shen Qian Li Caole Li Jiaxi Li Wei Zhao Chen Zhang Lieyu 《Environmental science and pollution research international》2021,28(26):34200-34210
Environmental Science and Pollution Research - Zerovalent iron (ZVI) has been a major focus of research and has attracted great attention during the last 2 decades by international researchers... 相似文献
858.
Zhou Yunfei Yan Chunjie Zhou Sen Liang Tian Wen Xue 《Environmental science and pollution research international》2019,26(10):9861-9875
Environmental Science and Pollution Research - Montmorillonite grafted polyacrylic acid composite (GNM) was prepared by using ultraviolet radiation grafting method in this work. The synthesized... 相似文献
859.
为探讨广州和香港市区玻璃表面薄膜上有机质和PAHs的分布特征,从2007年12月至2008年1月,利用低尘擦拭纸采集广州和香港室内外相对应的15对玻璃表面薄膜样品.结果表明,广州室内外有机质占表面薄膜重量的1.8%和1.1%,香港则分别为3.9%和1.6%.玻璃表面薄膜上Σ15PAHs浓度的最高值达到1430ng/m2,以菲,芴,荧蒽,芘等为主.室内外对比结果显示,主要以颗粒态形式存在的5~6环化合物室内外差别较大,广州室外比室内大约高1倍,而香港由于中央通风系统的过滤作用,其室外比室内高约5~10倍.根据有机质和PAHs浓度之间的相关性,认为室内外存在不同源强的有机质和PAHs来源,玻璃表面可能更有利于PAHs的光降解. 相似文献
860.